Issue #7795 has been reported by Student (Nathan Zook).
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Feature #7795: Symbol.defined? and/or to_existing_symbol
https://bugs.ruby-lang.org/issues/7795
Author: Student (Nathan Zook)
Status: Open
Priority: Normal
Assignee:
Category: core
Target version: next minor
I'm pulling this out from deep in the discussions of issue http://bugs.ruby-lang.org/issues/7791, Let Symbols be Garbage Collected.
The problem is that the extreme utility of symbols makes them enticed to use, which results in a DOS vulnerability. My proposal is to add either of a pair of methods that would make it easy to defend against a DOS along these lines.
#1) Symbol.defined?
In existing code, it would might like this:
class Symbol
def self.defined?(string)
all_symbols.any?{|sym| sym.to_s == string}
end
end
#2) to_existing_sym. This would be defined in the same places as to_sym, but would through an argument error if the symbol did not already exist.
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